Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:

1. Pons region of brain

2. Thalamus

3. Spinal cord

4. Right cerebral hemisphere

Respiration is controlled by

1. medulla oblongata

2. cerebellum

3. hypothalamus

4. cerebrum

Consider the characters of a respiratory control center in humans:
I. It is located in pons
II. It moderates the functions of respiratory rhythm center
III. Its absence results in an increase in depth of respiration

The respiratory control center is:

1. Pneumotaxic center

2. Apneustic center

3. Chemosensitive zone

4. Dorsal group

Match the following columns and select the correct option:

Pneumotaxic centre is located in:

1. Pons

2. Cerebrum

3. Medulla oblongata

4. Thalamus

Central chemoreceptors in the brain respond to changes in the

1. Oxygen concentration in blood

2. Carbon dioxide concentration in CSF

3. Oxygen concentration in CSF

4. Rate of oxidation of food content in the cell

Which substances when present in high level can activate the chemosensitive area present adjacent to rhythm centre?

1. $C{O}_2<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>O_2$

2. $HC{O}_3^{-}<mspace\; width="1em"></mspace>ions<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>O_2$

3. $C{O}_2<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>H^{+}<mspace\; width="1em"></mspace>ions$

4. $H^{+}<mspace\; width="1em"></mspace>ions<mspace\; width="1em"></mspace>and<mspace\; width="1em"></mspace>HC{O}_3^{-}$

Chemosensitive area of respiratory centre medulla is affected by

1. less CO₂ and H⁺ ions

2. less O₂ and H⁺ ions

3. excess CO₂ and H⁺ ions

4. excess O₂ and H⁺ ions.

Human beings have a significant ability to maintain and moderate the respiratory rhythm. This is done by neural control. Which of the following is not related with respiration ?

1. Pneumotaxic centre

2. Respiratory rhythm centre

3. Hypothalamus

4. Aortic and carotid body receptors

Aortic arch and carotid artery receptors cannot recognise changes in

1. CO_2­ Concentration

2. O_2­ Concentration

3. H⁺ ions Concentration

4. All of these